Bucket



Oct. 2, 1934.

T. F. BANIGAN BUCKET Filed March 29, 1933 www INVENTOR.

TTORNEY.

'Patented Oct. 2, 1934 PATENTl AofI-Flci'='.,

' BUCKET Thomas F. Banigan, Kenmore, N. Y., assig'nor to Du Pont Rayon Company, New York, N. Y., a corporation of Delaware f y Application March Z9, 1933, Serial No. 663,264

2 Claims. (Cl. 118-1) This invention relates to the use of centrifugal apparatus for the manufacture of artificial thread, horsehair, straw, or the like, such as threads of regenerated cellulose or'of cellulose 5 derivatives. The inventionwill be described in connection with the process of producing regenerated cellulose threads from viscose, but the particular description does not limit the invention.

In one method of manufacturing articial thread by the viscose process, the freshly spun thread is collected in a rapidly revolving bucketv which, to provide for safety and for the removal of liquids and gases, is located in a bucket compartment provided with drainage and ventilation. The rapidly revolving bucket throws out a spray of coagulating bath which saturates the air within the compartment. If the rate of removal of the saturated gas from 'the compartment by the Ventilating system is slow, crystals form in the compartment and on the outside Aof the bucket, increasing considerably the power necessary to rotate the bucket, particularly during the latter stages of the spinning cycle. Heat is` mechanically developed' within the bucket compartment', and the Ventilating system fails to cool the interior of the compartment suiliciently.

The adoption of high bucket speeds, has accentuated the difficulty of bucket compartment ventilation and has tended to increase crystal formation. Ventilation is frequently so bad that .with high bucket speeds sufficient air pressures are built up in bucket compartments to blow gas-laden air out between the compartment covers and through the funnel holes into the spinningrroom, making working conditions very undesirable. y

In the customaryinstallations, the bucket is served from the top; that is to say, the machine attendant withdraws the wound cake from the top of the bucket. This requires the location of the bucket relatively high in the compartment so that the top end of the bucket clears the underside of the compartment cover by only a small amount. V

It is an object of this invention to provide improved ventilation of bucket i compartments.

Other objects of the invention will be in part apparent and in part set forth as the description proceeds.

Theobject of this invention, generally speak-` ing, is accomplished by making the outside of the bucket frustro-conical with the base of the cone at the bottom of the bucket, therebycausing the air current to flow downward.

f In the drawing, Figure 1 is a section through the center of a centrifugal bucket located'in a bucket compartment; Figure 2 is a section through the center of a modified form of a bucket.

In Figure 1, 1 indicatesa spinning bucket; 2 indicates a cover for the bucket; 30-31 indicate the interior of the bucket which is provided with a 'ilare from bottom to top to permit withdrawal of the bucket cake; 40-41 indicate the 65v exterior of the bucket which is provided with a nare from top to bottom in order to direct the flow of air toward the Ventilating duct at the bottom of the bucket; 61 are drainage channels in the wallsof the bucket; are holes through 70 the walls leading to the channels for draining the bucket interior; indicates a bucket compartment; 83 indicates a cover for the bucket compartment; 84 indicates a hole in the bucket compartment cover through which a thread guide 75 may project into the interior of the bucket; v82 is "an opening in the base of the compartment leading to a Ventilating duct; 81 is the wall of the compartment above the duct.

The form of the invention just described iunc` sov tions as follows: As the thread is collected in the bucket, excess liquid from the thread is drained off through the holes in the bucket walls into the channels and is thrown toward the bottom of the bucket where it is drained o. 'I'he 35 Ventilating duct in standard practice is exhausted by a fan and tends to withdraw the saturated air from the interior of the bucket compartment. The bucket is frustro-conical interiorly with a flare toward the top to allow the attendant to remove the bucket cake and is frustro-conical exteriorly with the largest portion of the cone toward the bottom in order that the bucket may act as a blower and throw the saturated air in the compartment toward the Ventilating duct.

In Figure 2 is shown a modiedV form of the invention wherein the bucket is provided with hollow walls to reduce its weight. In this iigure, 50 are holes through the inner wall; 51 is a hollow space within the walls and 52 is a hole through the outer wall provided for the escape of uid into the bucket compartment.

An advantage is in improving the ventilation of a bucket compartment without the use of additional power either in the Ventilating system or in driving the buckets. Another advantage of the invention is a greatly improved ventilation of the spinning room and correspondingly improved working conditions. Another advantage of4 the invention is decreased crystallization in the llo.'

los;

' the specific embodiments thereof except as debucket compartment and decreased formation 1. In a spinning machine a bucket compartof salt crystals on the walls of the bucket with ment ventilated toward the bottomand therein an accompanying decrease in consumption of a centrifugal bucket having an interior are from power, particularly toward the end of the spinbottom to top and an exterior flare from top to ning cycle. Other advantages ofY the invention bottom. will beapparent. t 2. In a, centrifugal bucket spinning machine a As many apparently widely different embodie compartment, an opening therein to permit the ments of this invention may bemade without expulsion of air therefrom, and means within the departing from the spirit and scope thereof, it compartment to ex'peliair therefrom comprising is to be understood that I do not limit myself to a. centrifugal bucket having anjexterior conically shaped, and having the base of a cone in close proximityto the said opening n THOMAS F. BANIGAN.

fined inthe appended claims.

I claim: 

